Navy may help ailing Sydney whale

Hopes fade for Sydney whale calf
A humpback whale calf separated from its mother and trying to suckle from boats off Sydney, Australia, is weakening, observers say.

Quake kit registers navy exercise
Military activity at sea is picked up on equipment monitoring earthquakes in the UK.

Cities switch off for environment
Cities around the world, starting with Sydney, switch off the lights for an hour to highlight climate change.

Cities dim lights for environment
Cities around the world, starting with Sydney, switch off the lights for an hour to highlight climate change.

New walk from vexed space station
International Space Station astronauts try to resolve the latest of a series of glitches that have plagued their mission.